page_title: U6 (Berlin U-Bahn)
section_title: The northern extension
hierarchical_section_title: U6 (Berlin U-Bahn) / History / The northern extension
caption_attribution_description: Deutsch: U-Bahn Berlin, Bahnhof Scharnweberstraße (U6)
context_page_description: U6 is a Berlin U-Bahn line, 19.9 km long line with 29 stations. It runs in a north-south direction from the Berlin locality of Tegel in the north via Friedrichstraße to Mariendorf, a locality in the southern part of the city. It is a so-called large profile line.
  During the Cold War, both U6 termini were in the former West Berlin but the line passed under East Berlin for a short section of its route. Five of its stations were sealed off by East German authorities and the trains went through these so-called “ghost stations” without stopping, while a sixth, Friedrichstraße, remained open primarily as a transfer station between the U6 and the S-Bahn lines using the north-south S-Bahn tunnel, but also as an official border crossing between East and West Berlin.
  It was formerly named "Cᴵ" from 1923 to 1928.
context_section_description: Even as construction of the North-South/C Line began there were plans to extend it to Berlin-Tegel, and 400 meters of tunnel had been prepared by 1929. This extension from the existing Seestraße station to the center of Tegel made several bus and tram lines redundant and for that reason this stretch was the first to be worked on after the war in the western part of the city.
  The first pile was driven on 26 October 1953 at Müllerstraße north of the Seestraße station. The 6.9 km (4.3 mi) stretch was built in two sections:
  Seestraße to Kurt-Schumacher-Platz
  Kurt-Schumacher-Platz to Tegel
  For reasons of cost and because of a very high water table there, north of Kurt-Schumacher-Platz it was decided to put the track on an embankment instead of in a cutting. A ramp raise the track 15 meters to an embankment and onward to Berlin’s first station for large profile cars, the Scharnweberstraße station. After passing the Holzhauser Straße station on this northwestern stretch, the tracks return underground, following the course of Berliner Straße to the center of Berlin-Tegel.
   
  As was the case before World War II, the stations had a very functional design with its surfaces covered with bright, pastel-colored ceramic tiles. The embankment stations were built of reinforced concrete, which was typical for the time. Nowadays this gives them a very bulky appearance so they do not radiate the charm of many of the suburban stations, such as those on the U3 line to the south.
  A first section was opened on 3 May 1956, the second on 31 May 1958. With the opening of the C Line the northern Berlin Transport Company (BVG) network was completely restructured and numerous tram lines in this area could be eliminated.
caption: The embankment station at Scharnweberstraße
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